<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="text" name="" id="inp">
    <script>
        // let str = "           今天是2022年11月5日";

        // console.log(str);

        // str.trim() 去除首尾空格
        // console.log(str.trim());

        let inp = document.querySelector('#inp');

        inp.oninput = function(){
            console.log(this.value.trim());
        }


    </script>
</body>
</html>